Science: Spying on Cells

If a biologist could look at a fertilized human egg-cell under a
super-powerful microscope, and study it under all sorts of conditions
without removing it from the body that contained it, he might be able
to tell whether that cell would become a still-born child or one that
would live to ripe age. The biologist cannot do that, but he is
learning more & more about the nature of cells, and with each new bit
of cell knowledge comes new knowledge of the nature of human beings,
who are just cells multiplied and...